1. Articles from J. TAGAMI

    1-19 of 19
    1. Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography

      Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography

      Purpose: The first objective of this study was to determine whether the luting material used for computer-aided design and computer-aided manufacture resin nanoceramic inlays affected interfacial adaptation. The second objective was to investigate whether application of a universal dentin adhesive before cementation affected interfacial adaptation. The final objective was to compare the inlay-side and dentin-side interfaces in the cement space. Methods and Materials: Seventy-four class I cavities were prepared on extracted human third molars. Cavities were optically scanned, and resin nanoceramic inlays were milled using Lava Ultimate blocks (3M ESPE). For the control groups, the fabricated inlays were cemented using ...

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    2. Effect of Light Irradiation Condition on Gap Formation Under Polymeric Dental Restoration; OCT study

      Effect of Light Irradiation Condition on Gap Formation Under Polymeric Dental Restoration; OCT study

      Objective To investigate the effect of two light-curing systems; quartz tungsten-halogen (QTH) and light-emitting diode (LED), and irradiation time on interfacial gap formation of dental composite resin restorations bonded with an adhesive resin using optical coherence tomography (OCT). Materials and Methods Forty cavities were prepared in extracted human molar teeth and divided into four groups (n = 10) based on the type of light curing system QTH (LITEX 680A) and LED (Demi Plus) and curing duration (10 s or 40 s). A single-step self-etching dental adhesive (Tetric® N-Bond; Ivoclar Vivadent AG, Schaan, FL, Liechtenstein) was applied and polymerized with QTH for ...

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    3. Three-Dimensional Analysis of Enamel Crack Behavior Using Optical Coherence Tomography

      Three-Dimensional Analysis of Enamel Crack Behavior Using Optical Coherence Tomography

      The aim of this study was to nondestructively analyze enamel crack behavior on different areas of teeth using 3D swept source-optical coherence tomography (SS-OCT). Ten freshly extracted human teeth of each type on each arch ( n = 80 teeth) were inspected for enamel crack patterns on functional, contact and nonfunctional, or noncontact areas using 3D SS-OCT. The predominant crack pattern for each location on each specimen was noted and analyzed. The OCT observations were validated by direct observations of sectioned specimens under confocal laser scanning microscopy (CLSM). Cracks appeared as bright lines with SS-OCT, with 3 crack patterns identified: Type I ...

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    4. Microgaps and Demineralization Progress around Composite Restorations

      Microgaps and Demineralization Progress around Composite Restorations

      This study investigated the influence of adhesives and marginal sealing on demineralization progress using optical coherence tomography (OCT). Cavities (4 × 2 mm) were prepared in bovine incisors and restored using Clearfil SE Protect (SP), Bond Force (BF), Scotchbond Universal (SB), or G-Bond Plus (GB), followed by Estelite Flow Quick flowable composite. The control group received no adhesive ( n = 10). After 3-d incubation in artificial saliva and 10,000 thermal cycles, gaps at enamel and dentin margins were measured at 8 locations on cross-sectional images obtained from each restoration using swept-source OCT at 1310-nm wavelength. Specimens were demineralized using acidified gel ...

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    5. Estimation of the Enamel and Dentin Mineral Content from the Refractive Index

      Estimation of the Enamel and Dentin Mineral Content from the Refractive Index

      Recent advances in the field of optics have enabled accurate and localized measurement of optical properties of biological substrates. This work aimed to elucidate the relationship between the local refractive index ( n ) and mineral content (MC) of enamel and dentin. De- and remineralized lesions in bovine enamel and dentin blocks were sectioned into 300- to 400-µm-thick slices, and placed on a metal plate to capture images of sound, de- and remineralized regions transversely by optical coherence tomography. Mean n at each depth level of the lesion (20- or 40-µm steps for enamel or dentin) was measured by the ...

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    6. Noninvasive cross-sectional imaging of incomplete crown fractures (cracks) using swept-source optical coherence tomography

      Noninvasive cross-sectional imaging of incomplete crown fractures (cracks) using swept-source optical coherence tomography

      Aim:  To investigate the ability of swept-source optical coherence tomography (SS-OCT) to detect incomplete crown fractures (cracks) in extracted teeth. Methodology:  Cracks were created by subjecting 30 porcine premolars to impaction by a steel rod plunging from the occlusal tip. SS-OCT images and stereomicroscopic photographs of the surface were acquired for each specimen before and after impaction. For evaluation, the focused light beam of SS-OCT was projected from 3 directions on the same plane: buccal or lingual, 45° to the mesial, and 45° to the distal. Histological sections were prepared after impaction, and length and width of cracks and lamellae ...

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    7. Local Refractive Index of Human Enamel and Dentin by OCT

      Local Refractive Index of Human Enamel and Dentin by OCT
      Objectives: The aim of this study was to evaluate Swept Source Optical Coherence Tomography (SS-OCT) for measuring Refractive Index of sound Enamel and Dentin at different locations. Materials & Method: Enamel and Dentin slabs (300µm-thick) were sectioned to obtain enamel prisms cross-cut or long-cut and dentin with tubule orientations parallel, oblique or perpendicular to the cutting surface. Each slice was fine polished under running water, and then each placed on a metal plate in order to take B-scan images by SS-OCT (Proto type, Panasonic Shikoku Electronics Co., Ltd). The refractive index (n) at each location on a slab was calculated via ...
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    8. Marginal Adaptation of Self-Etch Adhesives by 3D Optical Coherence Tomography

      Marginal Adaptation of Self-Etch Adhesives by 3D Optical Coherence Tomography
      Objectives: The aim of this study was to investigate Swept Source Optical Coherence Tomography (SS-OCT) as a new tool to evaluate marginal adaptation of enamel and dentin restorations. Materials and Methods: Round-shaped class I cavities (3mm diameter, 1.5mm depth) were prepared on the buccal enamel of bovine teeth with the floor located in dentin. The cavities were restored with a flowable resin composite (Clearfil Majesty LV) using two-step self-etch adhesive (SE Bond), one-step self-etch adhesive (G-Bond) or no adhesive (Control). After water storage (37oC, 24h) or thermal stress challenge (5,000 cycles, 5oC and 55oC) marginal adaptation was evaluated ...
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    9. Optical Coherence Tomography for Detection of Experimentally Formed Enamel Cracks

      Optical Coherence Tomography for Detection of Experimentally Formed Enamel Cracks
      OBJECTIVES: The aim of this study was to investigate the use of swept-source optical coherence tomography (SS-OCT) for detection of experimentally formed infractions (cracks). METHODS: An SS-OCT (OCT-2000, Santec, Japan) system with a laser center wavelength of 1310nm was used. 10 porcine impacted premolars were subjected to impaction procedures by a steel rod plunging from the occlusal tip to create infractions. SS-OCT cross-sectional images and stereomicroscopic photographs of the surface at x10 magnifications were acquired for each sample before and after impaction. The focused light beam of SS-OCT was projected from three directions on the same plane; buccal or lingual ...
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    10. Orthodontic Bracket Debonding Enamel Damage Assessment Using Optical Coherence Tomography

      Orthodontic Bracket Debonding Enamel Damage Assessment Using Optical Coherence Tomography
      jectives: To assess the damage caused to the enamel surfaces following debonding of orthodontic brackets, bonded with or without acid-etching of the enamel surfaces prior to application of a self-etching adhesive system. Furthermore, to examine the usefulness of optical coherence tomography in detecting enamel surface damage. Methods: Unground enamel surface of extracted human premolars were cleaned and prepared with pumice. The specimens were divided into two groups and orthodontic brackets were bonded, with only one group etched with 37% phosphoric acid prior to the application of the self-etching bonding agent, Clearfil Protect Bond® (Kuraray Medical, Tokyo, Japan) (n=12). After ...
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    11. Diagnosis of Interdental Cavitated Caries Lesions by Optical Coherence Tomography

      Diagnosis of Interdental Cavitated Caries Lesions by Optical Coherence Tomography
      Objectives: The objective of this study was to utilize a swept-source OCT (SS-OCT) system to assess the contacting approximal lesions. Methods: Extracted human molars were used; in the first and second groups, non-caries molars were paired and mounted into the resin mold, in proximal contacts to each other. The presence of proximal contact was confirmed using an articulating paper. Enamel (group 1) or dentin (group 2) cavities were prepared on one proximal surface, using a round diamond bur just below the contact point. In the third group, molars with proximal enamel caries lesions were paired with intact teeth and mounted ...
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    12. Non-invasive Cross-sectional Visualization of Enamel Crack using OCT

      Non-invasive Cross-sectional Visualization of Enamel Crack using OCT
      Objective:Detection of enamel crack by current methods is not highly sensitive. Optical coherence tomography (OCT) is a promising diagnostic method for creating cross-sectional imaging of internal biological structures by measuring echoes of backscattered light. In this study, we examined a swept-source OCT (SS-OCT) as a diagnostic tool for enamel crack. Method: Swept-source optical coherence tomography (SS-OCT, Proto type, Panasonic Shikoku Electronics Co., Ltd, Japan) is a variant of OCT and sweeps the near-IR wavelength at a rate of 30-kHz over a span of 100 nm centered at 1330 nm. SS-OCT time-encodes the wavenumber by rapidly turning the narrowband and ...
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    13. Diagnosis of Occlusal Caries using Swept-source Optical Coherence Tomography

      Diagnosis of Occlusal Caries using Swept-source Optical Coherence Tomography
      Objectives: Detection of pit and fissure caries by current methods is not highly sensitive. Optical coherence tomography (OCT) is a promising diagnostic method for creating cross-sectional imaging of internal biological structures by measuring echoes of backscattered light. In this ex vivo study, we examined a swept-source OCT (SS-OCT) as a diagnostic tool for occlusal caries. Methods: 117 investigation sites of occlusal fissures were selected from 62 extracted teeth and inspected visually using conventional dental equipment without any magnification. SS-OCT observation was also carried out on the same location as where the conventional inspection had been performed. The teeth were then ...
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    14. Demineralization Affects Refractive Indices of Human Enamel and Dentin

      Demineralization Affects Refractive Indices of Human Enamel and Dentin

      Objectives: Dental hard tissues and biomaterials can be non-destructively assessed using optical coherence tomography (OCT), an emerging diagnostic tool. Swept Source (SS)-OCT has an improved imaging resolution and speed. Depth resolved data obtained in B-scans can be used to assess the quality and depth-resolved information on the tissues. The measurements are affected by the optical properties of the tissue, such as refractive index (RI). The aim of this study was to examine the effects of demineralization on the refractive index of enamel and dentin using SS-OCT. Methods: In the first experiment, slices cut from human sound molars approximately 300 ...

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    15. Comparison Between SS-OCT & CLSM in Assessment of Restoration Defects

      Comparison Between SS-OCT & CLSM in Assessment of Restoration Defects

      Objectives: Composite restorations suffer from polymerization shrinkage upon curing, which leads to gap formation at the tooth-restoration interface. These gaps might weaken the restoration integrity and vary in size. The aim of this study is to assess the tooth-restoration interface using swept source optical coherence tomography (SS-OCT) and to compare the findings with confocal laser scanning microscope (CLSM). Methods: Round class-I cavities 3mm in diameter and 1.5mm in depth were prepared on 16 human premolars. After application of Clearfil Tri-S bond, four types of composite restoration were tested; Flow FX, Majesty Posterior, Clearfil AP-X and Majesty LV (all by ...

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    16. Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT

      Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT

      Objective: The aim of this study was to determine the effect of hydration in assessment of reflectivity and depth measurements of demineralised enamel lesion using Swept-source Optical Coherence Tomography (SS-OCT). Methods: Bovine enamel blocks were used. B-scans of all specimens were obtained and recorded as reference using SS-OCT (OCT2000, Santec, Japan). The specimens were kept in a demineralizing solution adjusted at pH 4.8 at 37degrees-C. After 3, 9 and 15 days the demineralized surfaces were scanned again. All scans were performed at both controlled air-dried and moist conditions. At day 15, the specimens were sectioned and the lesions depths ...

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    17. Real-Time Gap Formation of Resin Composites Using SS-OCT During Photopolymerization

      Real-Time Gap Formation of Resin Composites Using SS-OCT During Photopolymerization
      Objectives: The purpose of this study was to evaluate real-time gap formation at dentin cavity floor of resin composites using swept source optical coherence tomography (SS-OCT) during photopolymerization. Methods: Dentin discs (Ø: 6 mm; n=3 x 3) with cavities (Ø: 3 mm; h: 1 mm) where prepared, randomly divided in three experimental groups and single layer bulk filled with micro-hybrid composite Clearfil AP-X/APX, nano-filled Clearfil Majesty Posterior/MP and flowable Clearfil Majesty Flow/MF without any conditioning, priming or bonding treatment. Real-time tomographic videos of all specimens were recorded using an SS-OCT unit (Santec, Japan) with 1310nm laser ...
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    18. Real-time Tomographic Monitoring of Composite Restoration Placement Using SS-OCT

      Real-time Tomographic Monitoring of Composite Restoration Placement Using SS-OCT

      Objectives: The aim of this study was to use swept-source optical coherence tomography (SS-OCT) for real-time tomographic assessment of tooth/restoration complex during placement of resin composite. Methods: An SS-OCT system with a laser center wavelength of 1310nm was used to record tomographic images and videos during bulk placement and light-polymerization of four combinations of composite/adhesive materials; two low-shrinkage composites (Filtek Silorane/Adhesive and Kalore/SE Bond), and one conventional hybrid composite with either a two-step self etch or an all-in-one adhesive system (APX/SE Bond and APX/S3 Bond). The composites were bulk filled into 1.7-mm-deep standard ...

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    19. Optical Coherence Tomography for In-vivo Assessment of Class-III Composite Restoration

      Optical coherence tomography (OCT) is a non-invasive technique that can produce cross-sectional images of substructures in biological systems at a high-resolution. Objectives: The objective of this study was to utilize a novel OCT system to assess a class-III composite restoration clinically. Methods: A class-III composite restoration in the distal of a lower left canine of a patient recalled 14 years after the treatment was imaged using a hand-held in-vivo scanning probe attached to a newly developed swept-source optical coherence tomography (SS-OCT) system (OCT-2000, Santec, Japan). The light source repetitively sweeps the wavelength from 1260 nm to 1360 nm at a ...
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    1-19 of 19
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    Real-time Tomographic Monitoring of Composite Restoration Placement Using SS-OCT Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT Comparison Between SS-OCT & CLSM in Assessment of Restoration Defects Demineralization Affects Refractive Indices of Human Enamel and Dentin Non-invasive Cross-sectional Visualization of Enamel Crack using OCT Diagnosis of Interdental Cavitated Caries Lesions by Optical Coherence Tomography Orthodontic Bracket Debonding Enamel Damage Assessment Using Optical Coherence Tomography Optical Coherence Tomography for Detection of Experimentally Formed Enamel Cracks Local Refractive Index of Human Enamel and Dentin by OCT Feasibility of peripheral OCT imaging using a novel integrated SLO ultra-widefield imaging swept-source OCT device The role of optical coherence tomography in the diagnosis of afferent visual pathway problems: A neuroophthalmic perspective (Book Chapter) 'Y' split of the outer plexiform layer: an optical coherence tomography illusion!